"Has anyone had experience with the various aftermarket radios that fit the '47-'50 dash and which one is BEST for reliability, value and quality?"It looks like you are asking for opinions based on first-hand experience? Most likely, very few people will be able to provide personal experiences with multiple products.
Classic Parts (and others) now sell these updated RetroSound Radios[/url]:
"standard" Retro Classic Radio model "upscale" Retrosound Zuma model Retrosound Maybe someone has first-hand experience with one of these (or other) after-market radios?